Abstract
A series of conductive polymers, including poly(p-phenylene) (PPP), polythiophene (PT) and poly(4,4′-bis(N-carbazolyl)-1,1′-biphenyl) (PPN), were prepared via the electrochemical polymerization and their application as hole-transporting layer in CH3NH3PbI3 perovskite solar cells was explored. The open circuit voltage of the corresponding devices with an ITO/conductive-polymer/CH3NH3PbI3/C60/BCP/Ag construction was correlated directly with the work functions of the conductive polymers that served as the hole-selective contact materials to the perovskite layer, as well as the recombination resistances of the devices. Highest open circuit voltage of 1.05V was obtained on the devices with PPP that has a work function of −5.31eV as the hole-transporting layer. Its power conversion efficiency reached about 16.5% with a high fill factor of 0.75, good open voltage of 1.03V and short circuit current-density of 21.6mAcm−2. The results indicated that high conductive hole-transporting material with a work function about −5.3eV is more compatible with this device construction to afford desired hole-selective contact. Furthermore, this simple, prompt, controllable and economic method to prepare hole-transporting materials would be favorable for large-scale production of hole-transporting layer for perovskite solar cells.
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